ALPA Sync Release Mk II - for Copal 0 for handheld operation or cable release triggering (with cable release attachment) with digital backs from Hasselblad and Phase One/Mamiya. The ALPA Sync Release Mk II can be operated only with the newest type of Sync Cord with built-in electronic filter.Supported ALPA Sync Cord part no. : 170.800.461, 170.800.462.NOT supported ALPA Sync Cord part no. : 170.800.400, 170.800.450, 170.800.460, 170.800.498 and 170.800.499